h264parsebroken/invalidnal

这个问题通常是由于h264的NAL单元（编码单元）错误或不完整引起的。将以下代码示例添加到gstreamer管道中可以修正此问题：

pipeline = Gst.Pipeline() ... h264parse = Gst.ElementFactory.make("h264parse", "h264parse") ... pipeline.add(h264parse) ... sink = Gst.ElementFactory.make("autovideosink", "video-output") ... pipeline.add(sink) ... h264parse.connect("src-allocated", on_h264parse_src_allocated) ...

def on_h264parse_src_allocated(h264parse, buf): # get the size of the current buffer buf_size = buf.get_size()

# get the size of the previous buffer
prev_size = h264parse.prev_buf_size

# If we have a new buffer and the previous buffer was incomplete,
# add the new buffer to the previous buffer. If the result is a
# complete NAL unit, push it downstream.
if prev_size > 0:
    new_data = buf.extract(0, buf_size, Gst.Buffer.new_allocate(None, buf_size, None))
    h264parse.prev_buf.append(new_data)

    nal = h264parse.find_nal_start()

    while nal != -1:
        end = h264parse.find_nal_end(nal)

        if end == -1:
            break

        nal_size = end - nal
        nal_buf = h264parse.prev_buf.extract(nal, nal_size, None)

        sink.emit("push-buffer", nal_buf)
        h264parse.prev_buf = h264parse.prev_buf.extract(end, prev_size - end, Gst.Buffer.new_wrapped(None))

        nal = h264parse.find_nal_start()

else:
    h264parse.prev_buf_size = buf_size
    h264parse.prev_buf = buf

return Gst.FlowReturn.OK

在这个示例中，我们添加了一个回调函数来处理每个新的h264parse缓冲区。如果这个缓冲区与之前的缓冲区组合成一个完整的NAL单元（编码单元），则使用autovideosink向下游推送它。否则，我们